Single port wide band impedance matching circuit with narrow band harmonic bypass, wireless communication device, and method for providing antenna matching

ABSTRACT

The present application provides a single port wide band impedance matching circuit and method for providing antenna matching. The single port wide band impedance matching circuit includes a single signal port adapted for receiving a wide band signal. The single port wide band impedance matching circuit further includes an impedance matching circuit including a narrow band harmonic bypass. Still further, the single port wide band impedance matching circuit includes an antenna port coupled to the single signal port via the impedance matching circuit.

FIELD OF THE APPLICATION

The present disclosure relates generally to impedance matching circuitsfor use with an antenna in a wireless communication device, and moreparticularly, to a single port impedance matching circuit with aharmonic bypass.

BACKGROUND

Wireless communication devices are continuously integrating new andenhanced features and capabilities, that leverage an ability to remotelytransmit and receive data using wireless communication capabilities. Asthe features and capabilities are added and/or enhanced, there often isa need to communicate wirelessly an ever increasing amount ofinformation/data in order to support the added and/or enhanced featuresand capabilities of the device. However, increasing a device's abilityto communicate information/data wirelessly is complicated by a furtherdesire to limit the overall size of the device, which can sometimes makedesirable an ability to share some of the circuitry and structure, whichis used to support various forms of wireless communications.

Diplexers can facilitate the sharing of resources by allowing multipleseparate signals to be merged onto a single terminal through frequencydomain multiplexing. For example, a diplexer can help facilitate a pairof ports each respectively associated with its own transceiver beingcoupled to a common shared port that can be associated with a singleantenna. Diplexer are generally different than a combiner or splitter inthat each of the ports to be merged are often frequency selective, whichcan also serve to allow multiple separate signals to be merged whilehelping to reduce the potential for interference between the signalsbeing merged.

Some forms of wireless cellular communications, in order to increase therate of data that can be communicated, will allow a larger amount offrequency bandwidth to be utilized in support of the communicationthrough carrier aggregation, which can sometimes make use ofnon-contiguous frequency bands. The increase in available bandwidth forsupporting a particular communication will often allow for acorresponding increase in the bitrate of the data being communicated viaa signal using the increased amount of allocated bandwidth.

Conventionally, bands having carrier frequencies below about 800 MHz arereferred to as ultralow bands. Bands between 800 MHz and 1500 MHz areoften referred to as low bands. Bands between 1500 MHz and 2200 MHz areoften referred to as mid bands, and bands greater than 2200 MHz areoften referred to as high bands. Previously, cellular service providershave supported a number of two-downlink carrier aggregation bandcombinations, including simultaneous ultralow band or low band operationwith mid band or high band operation. At least some filter supplierspromote signal combining using various diplexers, triplexers andquadriplexers in the front end of the wireless radio frequencycommunication circuitry separate from the antenna matching circuitry.While diplexing, triplexing, etc. type circuits in the front end portionof the radio frequency communication circuitry can be cheaper thanincorporating the diplexing, triplexing, etc. functionality in a tunableantenna match, this type of circuit can result in antenna matching inthe context of a wideband signal, wherein carrier aggregation caninvolve a harmonic being produced by a tuner with respect to one of thebands being aggregated, which is in a band of interest in another one ofthe bands being aggregated. A tunable antenna match can sometimesinvolve the use of a variable capacitor, which in at least someinstances can have a less than desired linear response, which in turncan increase the likelihood of an undesirable harmonic being produced.The presence of the tuner harmonic can sometimes result in thedesensitizing of one or both of the receivers involved in the carrieraggregation operation.

The present innovators have correspondingly recognized that the harmfultuner harmonics associated with matching a wideband signal with anantenna through the use of a variable capacitor having a less thanoptimal linear response, which can have a harmful effect in at leastsome forms of carrier aggregation, can be addressed by introducing atrap across the tuner device in the matching circuitry for suppressingproblematic tuner harmonic frequencies. By making the trap tunable, thetrap can be adjusted to account for various different frequencies thatmay be problematic at different times, depending upon which ones of thecarrier frequencies are currently being aggregated.

SUMMARY

The present application provides a single port wide band impedancematching circuit. The single port wide band impedance matching circuitincludes a single signal port adapted for receiving a wide band signal.The single port wide band impedance matching circuit further includes animpedance matching circuit including a narrow band harmonic bypass.Still further, the single port wide band impedance matching circuitincludes an antenna port coupled to the single signal port via theimpedance matching circuit.

In at least one embodiment, the impedance matching circuit includes atunable antenna matching capacitance, and the narrow band harmonicbypass includes a series impedance in parallel with the tunable antennamatching capacitance of the impedance matching circuit. In at least someinstances the series impedance is tunable. In at least some of theseinstances, the tunable series impedance includes a tunable seriescapacitor, where the tunable series impedance can additionally include asecondary trap comprising a combination of an inductor coupled inparallel with a capacitor, where the combination is coupled in serieswith the tunable series capacitor.

The present application further provides a method for providing antennamatching. The method includes coupling a single signal port including awide band signal to an antenna port via an impedance matching circuit.The method further includes bypassing in the wide band signal at thesingle signal port, a narrow band harmonic of one of the signalfrequencies contained in the wide band signal.

The present invention still further provides a wireless communicationdevice. The wireless communication device includes one or moretransceivers, which are coupled to a single signal port coupled to theone or more transceivers, the single signal port including a wide bandsignal associated with the one or more transceivers. The wirelesscommunication device further includes an impedance matching circuitincluding a narrow band harmonic bypass, an antenna port coupled to thesingle signal port via the impedance matching circuit, and an antennacoupled to the antenna port.

These and other features, and advantages of the present disclosure areevident from the following description of one or more preferredembodiments, with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an exemplary wireless communication device;

FIG. 2 is a block diagram of a wireless communication device;

FIG. 3 is a block diagram of an exemplary single port wide bandimpedance matching circuit;

FIG. 4 is a more detailed circuit schematic of an exemplary single portwide band impedance matching circuit, illustrated in FIG. 3;

FIG. 5 is a circuit schematic of a further exemplary narrow bandharmonic bypass circuit;

FIG. 6 is a circuit schematic of an exemplary tunable narrow bandharmonic bypass circuit;

FIG. 7 is a flow diagram of a method for providing antenna matching; and

FIG. 8 is a flow diagram of a method of bypassing in a wide band signala narrow band harmonic.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

While the present invention is susceptible of embodiment in variousforms, there is shown in the drawings and will hereinafter be describedpresently preferred embodiments with the understanding that the presentdisclosure is to be considered an exemplification and is not intended tolimit the invention to the specific embodiments illustrated. One skilledin the art will hopefully appreciate that the elements in the drawingsare illustrated for simplicity and clarity and have not necessarily beendrawn to scale. For example, the dimensions of some of the elements inthe drawings may be exaggerated relative to other elements with theintent to help improve understanding of the aspects of the embodimentsbeing illustrated and described.

FIG. 1 illustrates a front view of an exemplary wireless communicationdevice 100, such as a wireless communication device. While in theillustrated embodiment, the type of wireless communication device shownis a radio frequency cellular telephone, other types of devices thatinclude wireless radio frequency communication capabilities are alsorelevant to the present application. In other words, the presentapplication is generally applicable to wireless communication devicesbeyond the type being specifically shown. A couple of additionalexamples of suitable wireless communication devices that mayadditionally be relevant to the present application in the incorporationand management of a single port wide band impedance matching circuit insupport of wireless communications can include a tablet, a laptopcomputer, a desktop computer, a netbook, a cordless telephone, aselective call receiver, a gaming device, a personal digital assistant,as well as any other form of wireless communication device that might beused to manage multiband communications, wideband communications, and/orwireless communications involving one or more different communicationstandards. A few examples of different communication standards includeGlobal System for Mobile Communications (GSM) Code Division MultipleAccess (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA),Long Term Evolution (LTE), Global Positioning System (GPS), Wi-Fi (IEEE802.11), as well as various other communication standards. In addition,the wireless communication device 100 may utilize a number of additionalvarious forms of communication including carrier aggregation andsimultaneous voice and data that concurrently enables the use ofsimultaneous signal propagation.

In the illustrated embodiment, the radio frequency cellular telephoneincludes a display 102 which covers a large portion of the front facing.In at least some instances, the display can incorporate a touchsensitive matrix, that can help facilitate the detection of one or moreuser inputs relative to at least some portions of the display, includingan interaction with visual elements being presented to the user via thedisplay 102. In some instances, the visual element could be an objectwith which the user can interact. In other instances, the visual elementcan form part of a visual representation of a keyboard including one ormore virtual keys and/or one or more buttons with which the user caninteract and/or select for a simulated actuation. In addition to one ormore virtual user actuatable buttons or keys, the device 100 can includeone or more physical user actuatable buttons 104. In the particularembodiment illustrated, the device has three such buttons located alongthe right side of the device.

The exemplary hand held electronic device, illustrated in FIG. 1,additionally includes a speaker 106 and a microphone 108 in support ofvoice communications. The speaker 106 may additionally support thereproduction of an audio signal, which could be a stand-alone signal,such as for use in the playing of music, or can be part of a multimediapresentation, such as for use in the playing of a movie, which mighthave at least an audio as well as a visual component. The speaker mayalso include the capability to also produce a vibratory effect. However,in some instances, the purposeful production of vibrational effects maybe associated with a separate element, not shown, which is internal tothe device. Generally, the speaker is located toward the top of thedevice, which corresponds to an orientation consistent with therespective portion of the device facing in an upward direction duringusage in support of a voice communication. In such an instance, thespeaker 106 might be intended to align with the ear of the user, and themicrophone 108 might be intended to align with the mouth of the user.Also located near the top of the device, in the illustrated embodiment,is a front facing camera 110. The wireless communication device willalso generally include one or more radio frequency transceivers, as wellas associated transmit and receive circuitry, including one or moreantennas that may be positioned internally relative to the device.

FIG. 2 illustrates a block diagram 200 of a wireless communicationdevice 100, in accordance with at least one embodiment. In theillustrated embodiment, the wireless communication device 100 includes acontroller 202, which is adapted for managing at least some of theoperation of the device 100. In some embodiments, the controller 202could be implemented in the form of one or more processors 203, whichare adapted to execute one or more sets of pre-stored instructions 204,which may be used to form or implement the operation of at least part ofone or more controller modules including those used to manage wirelesscommunication. The one or more sets of pre-stored instructions 204 maybe stored in a storage element 206, which while shown as being separatefrom and coupled to the controller 202, may additionally oralternatively include some data storage capability for storing at leastsome of the prestored instructions for use with the controller 202, thatare integrated as part of the controller 202.

The storage element 206 could include one or more forms of volatileand/or non-volatile memory, including conventional ROM, EPROM, RAM, orEEPROM. The possible additional data storage capabilities may alsoinclude one or more forms of auxiliary storage, which is either fixed orremovable, such as a hard drive, a floppy drive, or a memory stick. Oneskilled in the art will still further appreciate that still otherfurther forms of storage elements could be used without departing fromthe teachings of the present disclosure. In the same or other instances,the controller 202 may additionally or alternatively incorporate statemachines and/or logic circuitry, which can be used to implement at leastpartially, some of the modules and/or functionality associated with thecontroller 202.

In the illustrated embodiment, the device further includes one or moretransceivers 208, which are coupled to the controller 202 and whichserve to manage the external communication of data including theirwireless communication using one or more forms of communications. Insuch an instance, the transceivers will generally be coupled to anantenna 210 via which the wireless communication signals will beradiated and received. For example, the one or more transceivers 208might include a receiver for supporting communications with a globalpositioning system, one or more transceivers for supporting cellularradio frequency communications, a transceiver for supporting Bluetooth®type communications, as well as a transceiver for supporting Wi-Fi® typecommunications. Transceivers for other forms of communication areadditionally and/or alternatively possible. While in some instances eachtransceiver can be associated with a separate antenna, it is envisionedthat in the present instance an antenna may be able to support multipletransceivers and/or multiple forms of communication. In the presentinstance, the one or more transceivers 208 are coupled to an antenna 210via a multiplexer 211 and a single port wide band impedance matchingcircuit 212, which together can help to facilitate the multipletransceivers 208 simultaneously interacting with a common antenna 210.While a single antenna is illustrated as interacting with the multipletransceivers 208, it is possible that some of the one or moretransceivers could be associated with its own or a different antenna. Inother word, the present embodiment does not preclude some transceiversfrom operating with alternative additional antennas, but the multiplexer211 and single port wide band impedance matching circuit 212 can help toassist multiple transceivers 208 in their separate and/or simultaneousoperation with a single common antenna 210. The multiplexer 211 isintended to allow multiple ports, in this case each generally beingassociated with a respective transceiver, to be merged with a singleshared port, which in the present instance is then coupled to an antenna210 via an impedance matching circuit 212.

By including a multiplexer 211 as part of the front end of the wirelesscommunication circuitry, separate from any impedance matching, it ispossible to use standard, off the shelf components available from filtersuppliers, which are often generally less expensive. The multiplexer 211can include various combinations of diplexers, triplexers andquadriplexers. Multiplexing in the front end can also involve transmitand receive signal combining at the duplex filter. The inclusion ofmultiplexing in the front end will generally result in the use of asingle port matching circuit. However one drawback to the use of atleast some single port matching circuits in a wide band application,such as where carrier aggregation is being used, involves the possiblereceiver desensitization as a result of a harmonic from at least onefrequency of interest being erroneously detected as a valid signal atanother expected frequency of interest. In order to attempt to minimizethe risk of these potential problems, the present disclosure includes asingle port wide band impedance matching circuit 212, which incorporatesa tunable harmonic suppression circuit in the form of a narrow bandharmonic bypass circuit, which is discussed in greater detail below.

In the illustrated embodiment, the device 100 can additionally includeuser interface circuitry 214, some of which can be associated withproducing an output 216 to be perceived by the user, and some of whichcan be associated with detecting an input 218 from the user. Forexample, the user interface circuitry 214 can include a display 102adapted for producing a visually perceptible output, which may furthersupport a touch sensitive array for receiving an input from the user.The user interface circuitry may also include a speaker 106 forproducing an audio output, and a microphone 108 for receiving an audioinput. The user interface output 216 could further include a vibrationalelement. The user interface input 218 could further include one or moreuser actuatable switches 104, one or more sensors, as well as one ormore cameras 110. Still further alternative and additional forms of userinterface elements may be possible.

FIG. 3 illustrates a block diagram 300 of an exemplary single port wideband impedance matching circuit. The exemplary single port wide bandimpedance matching circuit includes a single port 320 coupled to anantenna 310 via a narrow band harmonic bypass circuit 322 and animpedance matching circuit 324.

FIG. 4 illustrates a block diagram 400 of a more detailed circuitschematic of an exemplary single port wide band impedance matchingcircuit, illustrated in FIG. 3. In the illustrated embodiment, thesingle port 420 is coupled to the antenna 410 via an impedance matchingcircuit 424. A narrow band harmonic bypass circuit 422 is coupled to theimpedance matching circuit 424. In the particular embodimentillustrated, the narrow band harmonic bypass circuit 422 includes aseries combination of an inductor 432 and a capacitor 434, which iscoupled in parallel with a tunable antenna matching capacitor 430 of theimpedance matching circuit 424. Together, the narrow band harmonicbypass circuit 422 provides a narrow band attenuation at a predeterminedfrequency that can be controlled through the selection of the value ofthe inductor 432 and the capacitor 434. The narrow band harmonic bypasscircuit 422 has the effect of trapping at least some of the energypresent at the selected predetermined frequency, and preventing theenergy at this frequency from propagating between the antenna 410 andthe single port 420 which in turn can be coupled to the one or moretransceivers 208 via the front end mutiplexer circuit 211.

A further network of inductors and capacitors comprising a laddernetwork of alternating shunt and series component groupings, form theimpedance matching circuit 424, and serve to couple the single port 420to the antenna 410. More specifically, the impedance matching circuit424 includes a first component grouping in shunt, including in a firstcapacitor 428 in parallel with a first inductor 426, a second componentgrouping in series including a first tunable capacitor 430 and a secondinductor 436 in parallel with a second capacitor 438, a third componentgrouping in shunt including a third inductor 446 in parallel with athird capacitor 448, a fourth component grouping in series including afourth inductor 440 in parallel with a fourth capacitor 442, a fifthcomponent grouping in shunt including a fifth inductor 450, and a sixthcomponent grouping in series including capacitor 444.

The impedance matching circuit 424 serves to better match the impedanceof the antenna 410 to the circuit elements coupled to single port 420,which in turn facilitates more of the power associated with any signalat the single port being relayed between the antenna and the circuitelement coupled to the single port 420, such as the one or moretransceivers 208. The inductor and capacitor values of the impedancematch circuit 424 are designed to transform the antenna impedance to thetransceiver reference impedance. More specifically, the design is suchthat the input impedance is substantially equal to the transceiverreference impedance, typically 50 Ohms, and the output impedance issubstantially equal to the complex conjugate of the antenna 410impedance, which is the impedance needed to maximize the transfer ofpower into and out of the antenna 410. The instantaneous bandwidthwithin which the impedance can be transformed to the transceiverreference impedance depends on the mismatch between the antennaimpedance and the transceiver reference impedance. For small antennas,the mismatch tends to be large, resulting in low instantaneous antennabandwidth. The tunable capacitor 430 is employed to adjust the matchingcircuit thereby enabling the antenna to be matched over a range offrequency bands greater than the instantaneous bandwidth.

The tunable capacitor 430 can be implemented using one or more ofvarious technologies including devices based uponMicro-Electro-Mechanical Systems (MEMS), Barium Strontium Titanate(BST), and solid state FET switches built on insulated CMOS wafers(SOI/SOS). In at least one embodiment, tunable capacitors of the typeincluding Barium Strontium Titanate (BST) are used, which allows thecapacitance to vary through the application of a voltage to the device.The particular value of the tunable capacitors may be controlled by oneof the processors and/or one of the transceivers. With most tunablecapacitor technologies the capacitor linearity is lower than anequivalent fixed capacitor. Thus the tunable capacitor 430 tends togenerate harmonics which can be attenuated by the harmonic bypasscircuit 422. The harmonic bypass 422 can be employed to attenuateharmonics from other series connected non-linear devices in the signalpath, such as the antenna feed connector which can generate harmonicsdue to passive intermodulation.

The harmonic bypass circuit 422, being a series connected L, inductor432, and C, capacitor 434, provides an equivalent short circuit at theresonant frequency, F_(RES)=1/(2*π*SQRT(LC)). When designed for F_(RES)equal to a harmonic frequency, and connected in parallel with thetunable capacitor 430, the harmonic bypass circuit 422 attenuates theharmonics generated by the tunable capacitor 430. The harmonic bypasscircuit 422 ‘looks’ like a small capacitor at the fundamental frequency,and does not significantly affect the tuning operation of capacitor 430.Furthermore, the harmonic bypass circuit 422 ‘looks’ like a shortcircuit at the harmonic frequency, which can be implemented to reducethe constraints on the design of matching circuit 424 for operation inbands which include the harmonic frequency. In this way matching circuit424 can be designed with harmonic bypass circuit 422 such thattransceivers 208 transmit in a first band and simultaneously receive ina second band which is harmonically related to the first band, such thatthe antenna is well matched in the first and the second bands and thereceiver is not desensitized.

While the use of a single tunable narrow band harmonic bypass circuit322 is shown, for use in the exemplary single port wide band impedancematching circuit, it is possible that additional tunable narrow bandharmonic bypass circuits could be used to account for and trap more thanone harmonic frequency that might be of concern, i.e. by placingadditional series inductor and capacitor instances of the harmonicbypass circuit, designed for different resonant frequencies, in parallelwith the first series inductor 432 capacitor 434 combination of theharmonic bypass circuit 422. Such an example is illustrated in FIG. 5,which illustrates a circuit schematic 500 of a further exemplary narrowband harmonic bypass circuit 522. The further exemplary narrow bandharmonic bypass circuit 522 includes a first series inductor 532A andcapacitor 534A combination, as well as one or more additional seriesinductor 532 x and capacitor 534 x combinations in parallel with thefirst combination. As noted above each combination can be used to trap adifferent frequency.

Additionally and/or alternatively, the harmonic bypass circuit can betunable by employing tunable capacitor technology for the capacitor 434.Such an example is illustrated in FIG. 6, which includes a circuitschematic 600 of a still further exemplary narrow band harmonic bypasscircuit 622. The still further exemplary narrow band harmonic bypasscircuit 622 includes a series inductor 632 and capacitor 634combination, where the capacitor 634 is tunable. However, as noted abovewith respect to other tunable capacitors, a reduced linearity which canbe associated with at least some types of tunable capacitors, can be thesource of unwanted harmonics. In order to address any unwanted harmonicsfrom tunable capacitor 634, which could similarly contribute to adesensitization of the one or more transceivers 208, a parallel inductor652 and capacitor 654 combination having a resonant frequency at thefundamental could be coupled in series with the series inductor 632 andcapacitor 634 combination of the harmonic bypass circuit 622. Theparallel inductor 652 and capacitor 654 combination ‘looks’ like a largecapacitor at the harmonic frequency which can be accounted for such thatthe bypass circuit 322 has the desired resonant frequency at theharmonic frequency. Since the parallel inductor 652 and capacitor 654combination has a high impedance at the fundamental frequency the RFvoltage across capacitor 634 is lower than the RF voltage across tunablecapacitor 430 at fundamental, and the harmonic generation from capacitor634 is thereby reduced relative to the harmonic generation from tunablecapacitor 430. By incorporating a tunable capacitor as part of thenarrow band harmonic bypass circuit 622, the particular frequency atwhich the harmonics are bypassed can be tuned and/or adjusted.

FIG. 7 illustrates a flow diagram 700 of a method for providing antennamatching. The method includes coupling 702, a single signal portincluding a wide band signal to an antenna port via an impedancematching circuit. The method further includes bypassing 704 in the wideband signal at the single signal port, a narrow band harmonic of one ofthe signal frequencies contained in the wide band signal.

FIG. 8 illustrates a flow diagram 800 of a method of bypassing in a wideband signal a narrow band harmonic. Bypassing the narrow band harmonicof one of the signal frequencies contained in the wide band signalincludes tuning 802 the particular frequency at which the narrow bandharmonic is bypassed. In at least some instances, the tuning can beachieved by controlling the value of a series capacitor.

While the preferred embodiments have been illustrated and described, itis to be understood that the invention is not so limited. Numerousmodifications, changes, variations, substitutions and equivalents willoccur to those skilled in the art without departing from the spirit andscope of the present invention as defined by the appended claims.

What is claimed is:
 1. A single port wide band impedance matchingcircuit comprising: a single signal port adapted for receiving a wideband signal; an impedance matching circuit including a narrow bandharmonic bypass; and an antenna port coupled to the single signal portvia the impedance matching circuit.
 2. A single port wide band impedancematching circuit in accordance with claim 1, wherein the single signalport is coupled to one or more transceivers.
 3. A single port wide bandimpedance matching circuit in accordance with claim 2, wherein the oneor more transceivers are associated with one or more signals havingfrequencies which span a predetermined wide signal band.
 4. A singleport wide band impedance matching circuit in accordance with claim 2,wherein the single signal port is coupled to one or more transceiversvia a front end circuit including a diplexing circuit.
 5. A single portwide band impedance matching circuit in accordance with claim 4, whereinthe diplexing circuit includes one or more diplexers for merging signalsfrom the multiple transceivers with the single signal port.
 6. A singleport wide band impedance matching circuit in accordance with claim 1,wherein the impedance matching circuit includes a tunable antennamatching capacitance, and the narrow band harmonic bypass includes aseries impedance in parallel with the tunable antenna matchingcapacitance of the impedance matching circuit.
 7. A single port wideband impedance matching circuit in accordance with claim 6, wherein theseries impedance of the narrow band harmonic bypass is tunable.
 8. Asingle port wide band impedance matching circuit in accordance withclaim 7, wherein the tunable series impedance of the narrow bandharmonic bypass includes a tunable series capacitor.
 9. A single portwide band impedance matching circuit in accordance with claim 8, whereinthe tunable series impedance of the narrow band harmonic bypassadditionally includes a secondary trap comprising a combination of aninductor coupled in parallel with a capacitor, where the combination iscoupled in series with the tunable series capacitor.
 10. A single portwide band impedance matching circuit in accordance with claim 1, whereinthe narrow band harmonic bypass is configured to produce a short at apredetermined frequency.
 11. A single port wide band impedance matchingcircuit in accordance with claim 10, wherein the predetermined frequencycorresponds to a harmonic of a lower frequency signal included as partof the wide band signal received at the single signal port.
 12. A singleport wide band impedance matching circuit in accordance with claim 1,wherein the wide band signal includes at least a lower band signal and ahigher band signal.
 13. A single port wide band impedance matchingcircuit in accordance with claim 12, wherein the lower band signal andthe higher band signal, together, support carrier aggregation.
 14. Asingle port wide band impedance matching circuit in accordance withclaim 1, wherein the wide band signal includes an ultra low band signal,a low band signal, a mid band signal, and a high band signal.
 15. Asingle port wide band impedance matching circuit in accordance withclaim 1, which is incorporated as part of a wireless communicationdevice.
 16. A single port wide band impedance matching circuit inaccordance with claim 15, wherein the wireless communication device is aradio frequency cellular telephone.
 17. A method for providing antennamatching, the method comprising: coupling a single signal port includinga wide band signal to an antenna port via an impedance matching circuit;and bypassing in the wide band signal at the single signal port, anarrow band harmonic of one of the signal frequencies contained in thewide band signal.
 18. A method in accordance with claim 17, whereinbypassing in the wide band signal a narrow band harmonic includes tuningthe particular frequency at which the narrow band harmonic is bypassed.19. A method in accordance with claim 18, wherein tuning the particularfrequency includes controlling the value of a series capacitor.
 20. Awireless communication device comprising: one or more transceivers; asingle signal port coupled to the one or more transceivers, the singlesignal port including a wide band signal; an impedance matching circuitincluding a narrow band harmonic bypass; an antenna port coupled to thesingle signal port via the impedance matching circuit; and an antennacoupled to the antenna port.